he following information is given for cobalt at 1atm: boiling point = 3097 °C Hvap(3097 °C) = 389 kJ/mol melting point = 1495 °C Hfus(1495 °C) = 15.5 kJ/mol specific heat solid= 0.418 J/g°C specific heat liquid = 0.686 J/g°C What is H in kJ for the process of freezing a 46.3 g sample of liquid cobalt at its normal melting point of 1495 °C.

Solve the following problems following the method shown above. Useful Information: Specific heat of water, H20() = 4.18 J/g-"C Specific heat of ice, H20(s) = 2.04 J/g.C Specific heat of steam, H2O(g) = 2.00 J/g.C Heat of fusion of ice (0°C) = 334 J/g Heat of vaporization of water (100°C) = 2260 J/g Heat of condensation of water = 2260 J/g 4. Calculate the number of joules needed to turn 325 grams of water at 100°C to steam at 100°C. 5. Calculate the heat released when 875 grams of water at 0.0°C turns to ice at 0.0°C. 6. Calculate the number of joules needed to vaporize 2.00 x 102 grams of liquid ammonia at its boiling point and produce ammonia vapor at the same temperature. The heat of vaporization of liquid ammonia is 1374 J/g. 7. How much heat is needed to melt 25.4 g of iodine? Hr = 61.7 J/g. 8. How much heat is needed to melt 4.24 g of Pd? Hr = 162 J/g.

A 100 g sample of ice is heated from -15 oC to its melting point of 0 oC and then melted completely. Next it is raised to its boiling point of 100 oC and boiled completely. Finally the sample is heated to 115 oC. How much energy was absorbed by the sample at each step and in total? (Answer in kJ everytime. Always round to 2 decimals. Pay close attention to units!) Sice=2.1 J/goC Delta Hf = 6.02 kJ/mol Ssteam=1.7 J/goC Delta Hv = 2.26 kJ/g   Heat required to get ice to the melting point (kJ):  Heat of fusion (kJ):  Heat required to get water to the boiling point (kJ):  Heat of vaporization (kJ):  Heat required to get steam to final temp (kJ):  Total energy required (kJ):

What is the identity of a 10.0 solid metal sample that has its temperature increased by 14.0°C when q = 53.9 J of heat energy was absorbed? Metal sample: Au: 0.128 Ag: 0.235 Cu: 0.385 Fe: 0.449 Al: 0.903